Abstract
In Daye Iron Mine, the open-pit mining has ended and the underground mining started in 2003. The present pit slopes are as high as 430 m and the slope angle is up to 43°. During the process of open-pit to underground mining, the high-steep pit slopes would be affected by both open-pit mining and underground mining, and its deformation characteristics would become more complex. So in this paper, the trinity method of numerical simulation, model experiment and field test was adopted to analyze the displacement and stress fields systematically. The results show that: (1) Prominent rebound deformation occurs near the slope foot, which is induced by the unloading in open-pit mining. When it is backfilled to 0 m level, the rebound deformation decreases, which indicate that backfilling mass can restrict the deformation and improve the slope stability; (2) Subsidence dominates the slope deformation in open-pit to underground mining and it increases with an increasing elevation of monitoring point; the maximum horizontal displacement occurs in the lower part of the slopes, because the backfilled part is squeezed by both the north slope and the south slope, and it has a lower elastic modulus than the previous orebody; (3) The stress and its variability near the slope foot are much larger than other places, indicating that the slope foot is most affected by stress redistribution and stress concentration may occur here; the stress at other stress monitoring points changes little, indicating that the influence of open-pit to underground mining is local; (4) The effect of underground mining on the deformation of the faults is not prominent; (5) Mining operations in near-ground part affect more on the variation of deformation and stress of pit slopes than that in deeper part.
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Acknowledgments
The study was sponsored by the National Natural Science Foundation of China (Grant Nos. 41372312, 41072219 and 51379194), the Huanghe Yingcai (Science and Technology) program, the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (Grant No. CUGL140817) and the China Postdoctoral Science Foundation (Grant No. 2014M552113).
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Zhou, C., Lu, S., Jiang, N. et al. Rock Mass Deformation Characteristics in High-Steep Slopes Influenced by Open-Pit to Underground Mining. Geotech Geol Eng 34, 847–866 (2016). https://doi.org/10.1007/s10706-016-0009-7
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DOI: https://doi.org/10.1007/s10706-016-0009-7